living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Arthropoda Siebold, 1848 - arthropods
           Subphylum Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
             Subclass Cirripedia Lamarck - barnacles and their kin see Infraclass Cirripedia Burmeister, 1834
               Order Thoracica Darwin, 1854 - goose and acorn barnacles see Superorder Thoracica Darwin, 1854
                 Suborder Balanomorpha Pilsbry, 1916
                   Superfamily Chthamaloidea Darwin, 1854
                     Family Catophragmidae Utinomi, 1968
                       Genus Catomerus Pilsbry, 1916
                       Genus Catophragmus Sowerby, 1826
                       Genus Chionelasmus Pilsbry, 1911